/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.mock.http.client;

import org.springframework.http.HttpMethod;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.mock.http.MockHttpOutputMessage;
import org.springframework.util.Assert;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

/**
 * Mock implementation of {@link ClientHttpRequest}.
 *
 * @author Rossen Stoyanchev
 * @author Sam Brannen
 * @since 3.2
 */
public class MockClientHttpRequest extends MockHttpOutputMessage implements ClientHttpRequest {

    private HttpMethod httpMethod;

    private URI uri;

    @Nullable
    private ClientHttpResponse clientHttpResponse;

    private boolean executed = false;


    /**
     * Default constructor.
     */
    public MockClientHttpRequest() {
        this.httpMethod = HttpMethod.GET;
        try {
            this.uri = new URI("/");
        }
        catch (URISyntaxException ex) {
            throw new IllegalStateException(ex);
        }
    }

    /**
     * Create an instance with the given HttpMethod and URI.
     */
    public MockClientHttpRequest(HttpMethod httpMethod, URI uri) {
        this.httpMethod = httpMethod;
        this.uri = uri;
    }

    @Override
    public HttpMethod getMethod() {
        return this.httpMethod;
    }

    public void setMethod(HttpMethod httpMethod) {
        this.httpMethod = httpMethod;
    }

    @Override
    public String getMethodValue() {
        return this.httpMethod.name();
    }

    @Override
    public URI getURI() {
        return this.uri;
    }

    public void setURI(URI uri) {
        this.uri = uri;
    }

    public void setResponse(ClientHttpResponse clientHttpResponse) {
        this.clientHttpResponse = clientHttpResponse;
    }

    public boolean isExecuted() {
        return this.executed;
    }

    /**
     * Set the {@link #isExecuted() executed} flag to {@code true} and return the
     * configured {@link #setResponse(ClientHttpResponse) response}.
     *
     * @see #executeInternal()
     */
    @Override
    public final ClientHttpResponse execute() throws IOException {
        this.executed = true;
        return executeInternal();
    }

    /**
     * The default implementation returns the configured
     * {@link #setResponse(ClientHttpResponse) response}.
     * <p>Override this method to execute the request and provide a response,
     * potentially different than the configured response.
     */
    protected ClientHttpResponse executeInternal() throws IOException {
        Assert.state(this.clientHttpResponse != null, "No ClientHttpResponse");
        return this.clientHttpResponse;
    }


    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(this.httpMethod);
        sb.append(" ").append(this.uri);
        if (!getHeaders().isEmpty()) {
            sb.append(", headers: ").append(getHeaders());
        }
        if (sb.length() == 0) {
            sb.append("Not yet initialized");
        }
        return sb.toString();
    }

}
